What Range This Port Belongs To
Port 2489 sits in the registered ports range: 1024 to 49151.
Registered ports are different from the well-known ports below 1024 (HTTP, SSH, DNS — the ones everyone uses) and the ephemeral ports above 49151 (the temporary ports your OS grabs for outgoing connections). The registered range is IANA's middle tier: ports that a company, developer, or organization formally requested and was granted for a specific application.
The idea behind registration is reasonable. If you're building software that listens on a network port, you request a number from IANA so your software doesn't collide with someone else's. IANA records your name, your contact information, your service name, and grants you the assignment.
The TSILB Assignment
Port 2489 is officially assigned to a service named TSILB, for both TCP and UDP.1
The registrant on file is James Irwin at travsoft.com. That's the entirety of the public record. IANA's registry lists the service name as "TSILB" — the description field also just says "TSILB" — and provides no further documentation.
What does TSILB stand for? Unknown. What does it do? Unknown. Is the software still in use, ever shipped, or long abandoned? Unknown.
This isn't unusual. The IANA registered ports list contains thousands of entries like this one: a name, a registrant, and then silence. Port registrations don't expire. They don't require the registrant to publish documentation. Many were made in the 1990s and early 2000s by individuals and small companies building software that never gained traction, or that ran quietly inside private networks for years and then simply stopped.
Port 2489 is one of these. Officially claimed. Practically invisible.
How to Check What's Listening on This Port
If you see traffic on port 2489 and want to know what's using it:
On Linux or macOS:
On Windows:
The process ID in the output can be looked up in Task Manager or with Get-Process -Id <PID> in PowerShell.
If something is listening on port 2489 on your system, it isn't TSILB — at least not in any documented sense. It's almost certainly a custom application, a developer tool, or software that chose this port because it appeared unoccupied.
Why Unassigned-in-Practice Ports Matter
The registered ports range exists to create order. In practice, it's a registry with imperfect enforcement. Developers routinely pick numbers from the registered range without checking IANA, or check IANA and find a ghost entry like TSILB and treat it as functionally free.
This creates ambiguity. If you see port 2489 active on a machine, you can't assume it's TSILB (whatever that was). It could be anything. The port number tells you where to look, not what you'll find.
The honest answer for port 2489: officially assigned, practically uncharted. If you encounter it, investigate — don't assume.
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